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Begin with one of our most-loved collections and find a piece made for you.
Shop best sellersThe Signora diamond guide
Explore real visual differences between diamond grades. Move each scale, compare examples, and understand what to look for before choosing your stone.
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Color grade
D is the highest color grade and appears completely colorless under controlled grading conditions.
No inclusions and no blemishes are visible to a skilled grader using 10× magnification.
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Clarity grade
Compare the real stone with crown and pavilion plots to understand where clarity characteristics sit.
The diamond has an even pattern of bright and dark areas and scores in the top category for all grade-setting determinants.
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Cut grade
Compare three real examples at every grade to see how proportions influence brightness, fire, and scintillation.
Select a diamond, then move the scale to compare approximate face-up size.
Educational approximation only. Actual dimensions vary by shape and proportions.
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Carat weight
Carat measures weight—not quality. Compare how different weights can translate into visible size.
Diamond quality, clearly explained
The 4Cs are the shared language used to describe a diamond’s color, clarity, cut and carat weight. They help compare stones, but the best choice still depends on the exact diamond, its proportions, its grading report and how it looks to you.
Color grading measures the absence of body color. D is colorless; warmth becomes more visible as the scale continues.
Clarity considers inclusions and blemishes under 10× magnification, including their size, number, position and visibility.
Cut describes how proportions, symmetry and polish work together to create brightness, fire and scintillation.
Carat is a unit of weight. One carat equals 200 milligrams; face-up size still varies with shape and proportions.
How to use this guide
Start with cut because it strongly influences how a round brilliant handles light. Then choose a color and clarity range that looks right in your preferred metal and setting. Finally, compare carat weight with the millimeter measurements on the grading report.
Ready to explore real stones? Browse loose diamonds, discover engagement rings, or review the broader diamond and stone guide.
Diamond 4Cs questions
The 4Cs are cut, color, clarity and carat weight. Together they describe important quality and appearance characteristics used to compare diamonds.
Cut has the strongest direct relationship with how a round brilliant returns light. Good proportions, symmetry and polish support brightness, fire and scintillation.
Eye-clean is stone-specific, not guaranteed by one clarity label. Inclusion size, position, relief, viewing distance and lighting all affect whether a characteristic is visible without magnification.
Not always. Carat measures weight, while visible size depends on shape and proportions. Compare the diamond’s millimeter dimensions as well as its carat weight.
Yes. Lab-grown diamonds can be assessed for cut, color, clarity and carat weight using the same core grading criteria used for mined diamonds.
Yes. Book a complimentary consultation and share the grading reports or stone details you are considering. We can help you compare the trade-offs before you choose.
Choose with confidence
Bring us your preferred shape, budget or grading report. We will help you compare the exact stones and understand where your money makes the most visible difference.
